High tension fuse



Sept. 28, 1937. L HlLL 2,094,012

Original Filed July 9, 1928 3 Sheets-Sheet 1 JUN (11ml M; I H l lll hlllM IN V EN TOR.

6 ATTORNEYS.

Sept. 28, 1937. G. L. HILL 2,094,012

HIGH TENSION FUSE Original Filed July 9, 1928 5 Sheets-Sheet 2 INVENTOR.

07 of miijl' w 7 ATTORNEYS.

I, I I I Sept. 28, 1937. s. L. HILL HIGH TENSION FUSE 3 Sheets-Sheet 5 Original Filed July 9, 1928 INVENTOR.

"' BY 2 M ATTORNEYS.

Patented Sept. 28, 1937 A UNITED STATES PATENT OFFICE Application July 9, 1928, Serial No. 291,214

' Renewed September 19, 1934 v 56 Claims.

My present invention relates to high tension electric cut-outs and more particularly to fuses of the so-called expulsion type.

An object of my invention is to produce an improved form of high tension fuse which will readily interrupt the circuit upon the occurrence of an excessive overload or the like and efllciently extinguish any are established during the operation.

Another object of my invention is to provide a fuse of the above type with are extinguishing features which will operate positively and efficiently without danger to the fuse supporting structure.

A further object of my invention is to provide in a fuse of the above character, means whereby the arc when established by reason of interruption of the circuit. by the fuse, will be drawn into a zone under the direct action of anarc extinguishing substance and be blown" out thereby.

Another object of my invention is to provide in a fuse of the above type an arrangement whereby the arc extinguishing substance will not only function to extinguish any are established but will also function to force the adjacent ends of the fuse apart to thereby draw out the arc during the extinguishing period.

A further object of my invention is to provide an'arrangement whereby a tube of glass or other fragile material may be used as a portion of the fuse body without being subjected to internal pressures and fracture, as is the case with fuses of this type now on the market.

Another object of my invention is to provide in' a fuse of the above character, means whereby any are established by the fuse will be retained in a reinforced compartment in the presence of an arc extinguishing substance.

Other objects and advantages will be obvious to those skilled in the art and others will be hereinafter more specifically pointed out.

For the purpose of illustrating my invention, I have in the accompanying drawings illustrated several embodiments of my invention, but it should be understood that these drawings are to be taken as illustrating rather than limiting my invention.

In these drawings- Figures 1 and 2 are sectional views of preferred embodiments of my invention,

Figure 3 is a plan view taken along line III-III of Figure 1, looking in the direction of arrows,

Figure 4 is. a sectional view of a modified fuse embodying the features a: my invention,

Figure 5 is a sectional view of the fuse shown in Figure 4 taken along line V--V of Figure 4, looking in the direction of arrows,

Figure 6 is a view similar to Figure 5 taken along line VI-VI of Figure 4,

Figures 7 and 8 show further modifications of 5 my invention in section, Figure 8 being a fragmentary view, and

Figure 9 is a perspective view of a detail of the fuse shown in Figure 8.

In the drawings I show several distinct embodiments of my invention and for the purpose of explanation I shall discuss my invention separately inconnection with each sheet of the drawings, it being understood that like numerals throughout the several views refer to like parts.

In the drawings, III designates a tubular metallic member which forms a reinforcing housing about what I shall term the expulsion chamber of my fuse. This expulsion chamberis formed in the fuse shown in Figure l by an insulating lining I I, an end member I2 at the bottom thereof and a partition I3 at the top thereof. The member I2 is provided with shoulders which engage the member I I to form a seal therebetween. A cap or ferrule I4 is screw-threaded upon the tubular reinforcing member III and exerts pressure upon the members II and I2 in cooperation with an annular boss I5 carried by the member I0 which holds them tightly together. The member II is reduced in diameter at its upper end where it projects beyond the boss I 5 and forms, in conjunction with a similar upward projection upon the member I0, a seat for a glass tube I6. Upon the other end of the tube I6 there is mounted a second ferrule or contact I1. Connected to the inside of the ferrule I1 I show a spring I8 which is adapted when elongated to operate within the glass tube I8 and separate the ends of the fuse when the latter is broken by an excessive current. The spring I8 is shown as secured to a member I9 which forms an enlargement upon the end of a fuse 20. The member I9 projects through a central opening M in the partition I3 and through which it will be drawn when the spring I8 collapses. Adjacent the opening 2i through which the member I! projects I provide a baflle 22 which is biased by means of a spring 23 into a position where it will close the opening 2i when the member I9 is withdrawn through the partition I3. The lower end of the fuse 20 projects through a central opening 24 in the member I2 an is secured to a member 25 in intimate contact wi a fragile. disk 26. These parts may or may not be soldered together, the only requirement being that they be in good electrical contact. The part may also be eliminated where the fragile disk is sufiiciently strong tp withstand the tension occasioned by the spring I8 upon the fuse. The fragferrule I4 is provided with a central opening 28 below the fragile disk 26 which is somewhat larger than the opening 24 in the member I2 and the member 25 so that whenpressure is exerted upon the fragile diaphragm 26 by reason of pressures created within the expulsion chamber because of vaporization of the arc extinguishing substance 21, it will-rupture and permit the member 25 and the lower end of the fuse 20 to be blown outwardly and thus draw the arc down into the opening 24 and under the direct action of the arc extinguishing substance as it is discharged from the expulsion. chamber.

The opening 24 int-he member I2 is shown as provided with a widely tapering inlet and adjacent thereto and terminating midway the ends of the opening 24, I show a plurality'of other openings or conduits 29 which serve to direct the arc extinguishing substance in its discharge from the expulsion chamber against any are which may be established and drawn into the opening 24. 1

It should be pointed out here as. one of the important points of myrinvention that the opening 24 in the member I2 forms what might be termed an orifice through which it will be seen that the arc when established must pass in order to maintain itself in connection with the opposite side of the circuit. This is because the ferrule I4 will form one terminal of the circuit and desired.

the member I9, as long as it remains in the expulsion chamber, will form the other terminal, the are under these conditions having to pass through the orifice 24. As a result of the arrangement shown with the arc extinguishing substance within the expulsion chamber a condition is set up whereby the substance 21 in its dis charge from the expulsion chamber will fiow out through the orifice in direct opposition to the arc and interrupt and blow the; are out through the orifice in an' efiicient and efi'ective manner.

In Figure 3, the baflie 22 is shown as biased against the member I 9 by the spring 23 and from this view it will be seen that when the member I9 is withdrawn from the hole 2I the bailie 22 will be immediately moved over to the position illustrated in this yiew of the drawings by dotted line, where it will completely close theopening '2I and thus prevent the exit of any are extinguishing substance from the expulsion chamber into the glass tube I6. This will insure against the fracture of the glass tube I6, due to' internal pressures and also prevent its discoloration by the carbonized arc extinguishing substance. It will also insure that the full pressure of the expanding substance 21 will be exerted against the diaphragm 26.

' The fuse partially illustrated in Figure 2 embodies all of the characteristics of the fuse illustrated in Figure 1 with the exception of the baflie 22'. In this fuse the lining member Ila is modified so as to completely close the top of the expulsion chamberexcept for the opening 2la. It is further provided with a chamber 30 in which is arranged a plurality of balls 3| of insulating material. In the drawing five such balis are shown. The balls 3| are held in the chamber 30 by means of a closure member 32 having provided a plurality of openings 33 which function to permit the arc extinguishing substance when under pressure to enter thechamber 30 so that when the circuit is interrupted, the pressure exerted from within the expulsion chambef'will force the balls 3| upwardly where one of them will closethe opening -2Ia. as soon as the member I9a is withdrawn therefrom.

As a result of this construction, it will be seen that the pressures exerted by the arc extinguishing substance 210. will not only in this case serve to separate the fuse ends and extinguish the are, but will also function to seal the opening 2Ia against the escape of any arc extinguishing substance into the glass tube I611. The check valves 2I and 31 are primarily employed in conjunction with the glass'tubes shown at I6 or Ilia to prevent the gases generated during the blowing of the fuse from entering the tubes. These gases, when generated, are under a comparatively high .pressure and might cause breakage of the glass tubes. In some instances where a tube, such as check valves may be omitted. Y

The refill or renewable cartridge composed of the members II, I2, I3, 20, 2|, 25, 26 and the substance 21 with which the cartridge is filled,

see Fig. 1, and the members Ila, I 2a, 20a, 2Ia, 25, 26 and the substance 21a, see Fig. 2, when indicated at I6 or I6d are sufficiently strong the assembled formsa refill or'renewable cartridge for insertion into the end member ID of the "fuse tube or housing I6 by the mere removal of the ferrule I4. This is obviously more economical than renewing the whole device after it has operated from an overcurrent and has the advantage that refill units of various current ratings.

may be inserted into the main'fuse tube I6 as Referring now to the modification "illustrated on Sheet 2 of the drawings-and identified as Fig- I6 and the functions incidental to the spring' I8 present fuse comprises an insulating body mem-, ber 35 which carriesthe .cap or ferrule I'Ia. Extending through the member 35 is a stud 36 upon the end of which is formed a suitable contact making head 31; It will also be seen that the member I2a is modified so as to provide supporting means for the fuse within the expulsion chamber. This modification of' the member 12a contemplates the provision of two upstanding and parallel supports 38 which extend substan tially-to thetop of the expulsion chamber. v At the upper ends of these supports 38 there is provided a metallic connector clip 39 adapted to slidably engage the contact head 31 'upon the stud 36. This connector clip 39 cessive-curre'ntfiow and a second portion '42 at a point adjacent the openirng or orifice 24a. which is adapted' 'to break under the combined fusing ure 4, it will be. seen that the glass tube portion 60 are omitted. This particular structure of the p I a is provided with means for securing it to the ends of the supports and the stretching action caused by the expansion of the arc extinguishing substance 21b withinBthe expulsion chamber when the fusible porti n 4| is fused and the diaphragm 26a ruptures. In order to provide for tension upon the fused portion 42 when the fusible portion 4| is fused,'

' across its lower face with a closure means of metallic screen 41 and within the housing so formed and resting on the screen 41 I contemplate providing. a .quantity of metallic wool.

. This arrangement will insure against the escape of metallic particles from the fuse to the surrounding atmosphere and the metallic wool will also act to rapidly cool any gases and any other material which may escape therethrough. As an additional means of venting the chamber 46 there may also be provided suitable openings 49 at the upper part of the chamber. Obviously the housing member 45 is of any suitable material which will not be adversely'aifected by the molten metal from the fuse and at the same time will dissipate heat rapidly. Like the screen 41 the housing is preferably made of metal.

The operation of this embodiment of my invention is as follows: When the fuse is subjected to an excessive current, the fusible portion 4| of the fuse will burn away. This will create. an explosion in the expulsion chamber, and as a result, the diaphragm 26a will be ruptured and thus impose upon the weakened portion 42 of the fuse a tension which will cause it to also break. The breaking of the portion 42 will, as will be evident, establish a second arc in the lower part of the expulsion chamber and within the zone of the orifice 24a where it will be readily blown out and extinguished as previously described in connection with the modifications illustrated in Figures l and 2.

After a fuse of this type has operated to open the circuit, the problem of re-fusing can be conveniently carried out by removing the ferrule Ila. which will permit the withdrawal of the member I2a together with its fuse supporting members 38 so that the fuse together with a new diaphragm 25a may be conveniently mounted thereupon and reinserted in its operative position.

On Sheet 3 of the drawings I illustrate tw additional modifications of my invention. The modification identified as Figure 7 differs from the previous modification in that the fuse element has a single reduced portion. This fuse is provided with the-housing 45 and its metallic wool and screen outlet. fuse extends through the orifice 24b, the fuse is provided with an enlarged cylindrical head 50 which substantially fills the orifice 24b and functions in much the same manner as would a piston when pressure is exerted from within the expulsion chamber by reason of a fusing of the fuse. Th1S insures a more or less violent discharge of the arc extinguishing substance when the fuse breaks, which not only discharges the member 50, but by reason of the delay in the complete opening of the orifice 2417 a pressure is,

At the point where the.

built up in the chamber so that any arcestablished within the orifice will be subjected to a rapid flow of arc extinguishing substance out of the expulsion chamber. The diaphragm 26b in this case is secured to the member 50 by means of a screw The upper end of the fuse 200 is secured in the usual manner to a stud 52 extending through the member 350 and connecting with the ferrule H0. The modification illustrated in Figure 8 is constructed in substantially the same manner as the modification illustrated in Figure 7 with the exception that the plug member 50d in this case is made as a separate unit from the fuse and connects with a suitable clip 53 connected to a terminal member 54 upon which the fuse 20d is mounted. A fuse constructed in accordance with this embodiment of my invention possessesthe characteristics of the modification illustrated in Figure 4 in that a second arc is established in the zone of the orifice 24d where it'will come .under the direct arc extinguishing action of the arc extinguishing substance 21d.- When the fuse 20d interrupts'the circuit, a pressure will be set up within the expul-' sion chamber and, as a result, the member 50d will be blown out through the orifice 24d and out of contact with the clip 53 so that a second arc will be established at this point. The member 50d in this case is also secured to the diaphragm 26d by means of a screw 5|.

In order to renew the fuses ofthese latter modifications, it is only necessary to remove the ferrule If andthen by sliding the housing member llld upwardly, the upper terminal or fuse support will be exposed so that a fuse can be readily applied.

In the modification illustrated in Figure 8, the expulsion chamber lining element lid is shown as in one piece and having a closure member 55 in one side thereof so as to permit access to the interior for the purpose of renewing the fuse,

This member 55 is secured in place by means of supported on a bracket member 51 which is flared at the ends so as to fit within the conical portion of the aperture 24d where it is secured by any suitable means.

In the drawings, for the purpose of simplifying the same and to prevent confusion, I have shown the expulsion chamber as only partially filled with an arc extinguishing substance, but I desire to have it understood that I contemplate a complete filling of the fuse of any modification of my invention in some instances, and in this connection attention is directed'particularly to the modifications illustrated in Figures 1 and 2, wherein the glass tube it forms a part of the fuse. When fuses of this type are used on high voltage circuits, it will be found desirable, if not necessary, to completely fill the fuse so that the glass tubular portion It will 'then also contain the are extinguishing substance 21. When the fuse is so filled with the substance 21, it will be found necessary to cement the glass tube into the shell I0 so as to prevent leakage of the substance, it be ing understood that the cap l1 at the upp r end thereof will be also similarly cemented. I desire also to point out the fact that when the fuse is completely filled with an arc extinguishing substance in this fashion it will operate with equal while I have shown the preferred form of my invention as now known to me, it is to be understood that variouschanges may be made in its construction without departing from the spirit of the invention as defined in the appended claims. Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. In a fuse device of the expulsion type, the combination of a fuse supporting body having a closed compartment at one end thereof terminating in a. discharge orifice of small area, said compartment adapted to contain an arc extinguishing substance, a fusible element located within said closed compartment and extending through said orifice, a fragile diaphragm forming a closure for said orifice and adapted to be ruptured by pressure exerted from within said compartment due to the fusing of the fusible element, and means whereby the corresponding end ofithe fuse together with said substance will be blown out through said orifice when said diaphragm is ruptured, whereby any are established will be drawn out and extinguished by said substance in its discharge from said compartment.

2. In a fuse device of the expulsion type, a fuse supporting body member having a closed compartment at one end thereof adapted to contain an arc extinguishing substance, a fuse located within said compartment and submerged in said substance, a fragile diaphragm at one end of said compartment adapted to be ruptured by pressure exerted from within said compartment, a pressure resisting end member interposed between said compartment and said diaphragm and having a discharge orifice formed therein through which the fuse extends, and means whereby the corresponding end of the fuse will be pulled out through said'orifice as said diaphragm is rup-, tured to draw the are into said orifice where it is extinguished by the arc extinguishing substance in its discharge from said compartment.

3. In a fuse device of the expulsion type, a

M fuse supporting member having terminals at the ends thereof, a fuse extending between said terminals having a fusible portion located near one end thereof, a. closed compartment formed within the fuse supporting member and adapted to contain an arc extinguishing substance and enclose the fusible portion of said fuse, said compartment terminating in a discharge orifice through which the fuse extends, a fragile diaphragm adapted to be ruptured by pressure exerted from within said compartment and permit the corresponding end of the fusible element to' be pulled out of said orifice whereby any are established within the compartment will be brought under the direct action of said are extinguishing substance in its discharge from said compartment.

4. In a high tension fuse of the expulsion type,

the combination ofa relatively long body member of insulating material having a reinforced expulsion chamber at one end thereof adapted to contain an arc extinguishing substance, a dividing partition between said expulsion chamber and the remainder of said body member, a fuse supported .within said body member projecting through an opening in said partition and having a fusible portion locatedwithin said expulsion chamber, means for withdrawing the end of said fuse from said expulsion chamber through said partition when the fusible portion is fused, and

means for closing the opening through said partition whereby the escape of arc extinguishing substance from said expulsion chamber through the partition will be prevented.

5. Ina high tension fuse of the expulsion type,

' the combination of a relatively long body member of insulating material having a metallically reinforced expulsion chamber at one end thereof adapted to contain an arc extinguishing substance, a dividing partition between said expulsion chamber and the remainder of said body member, a fuse supported within said body member projecting through said partition and having a fusible portion located within said expulsion chamber, means for withdrawing the end of said fuse from said compartment through said parti tion when the fusible portion is fused, and means for closing the opening through said partition whereby the escape of arc extinguishing substance from said expulsion chamber through the partition will be prevented. a

6. In a high tension fuse of the expulsion type, the combination of a relatively long body member of insulating material having a reinforced expulsion chamber at one end thereof adapted to contain an arc extinguishing substance, a fusile conductor mounted within said expulsion chamber adapted to be fused by a predetermined current, a fragile diaphragm adapted to be connected to one of the terminals of the fuse element and be ruptured by pressure exerted from within said expulsion chamber, and means for connecting said diaphragm with said fuse adapted to be blown out of connection therewith when said diaphragm is ruptured to thereby draw any arc established under the direct action of said are extinguishing substance in its discharge from said compartment. I

'7. In a fuse device ofthe expulsion type, the combination of a fuse supporting body having a closed compartment adapted to contain an arc extinguishing substance, said compartment terminating in a discharge orifice, a fusible element located within said closed compartment with said are extinguishing substance and extending through said orifice, a fragile diaphragm forming a closure for said orifice and adapted to be ruptured by pre'ssureexerted from within said compartment due to the fusi'ng of the fusible elearc extinguishing substance will be blown out of said compartment and through said orifice, when said diaphragm is ruptured, whereby any are established will be drawn out and extinguished by said substance in its discharge from said compartment.

8. In a fuse device of the expulsion type, a fuse supporting member having terminals at the ends thereof, a fuse extending between said terminals having a fusible portion, a closed compartment adapted to contain an arc extinguishing substance and enclose" the fusible portion of said fuse, a fragile diaphragm at one end of said compartment adapted to be ruptured by pressure exerted from within said compartment to permit the corresponding end of the fuse element to be blown out of said compartment, and a plurality of radially arranged diverging conduits through which said are extinguishing substance may exit 9. In a fuse device, a fusible element, and

I a chamber, a fusible element and an arc extin-' means operable by pressure generated by fusion of said element to cause a stream of arc extinguishing substance to play upon an arc caused by said fusion, at an angle to cause extinction of said arc.

10. In a fuse device, a'hollow member forming guishing substance within said chamber, means operable by pressure generated by fusion of said element to expel automatically one end of said fusible element from said chamber and to direct a stream of said are extinguishing substance onto an are formed by said fusion; as the arc is drawn out by movement of said one end of said fusible element, said stream being directed thereupon and in a direction to cause a rapid extinction of said are.

- 11. In a'. fuse device, a fusible element, a closed compartment adapted .to contain an arc extinguishing substance, and means operable by pressure generated by fusion of said element to force the arc extinguishing substance into the arc stream at an angle and aid in the extinction of said arc.

12. In a fuse device, a fusible element, and means operable by pressure generated by fusion of said element to cause a stream of arc extinguishing substance to play at an angle upon an are caused by the fusion of said element thereby aiding in the extinction of said arc.

13. In a fuse device of the character described having a compartment formed therein and a discharge orifice in communication therewith, a fuse in the compartment, an arc extinguishing substance in the compartment, and angularly disposed passages formed in the device connected with the discharge orifice at one end and with the compartment at the other end whereby when the fuse blows an arc extinguishing substance is directed under pressure at an angle into the discharge orifice.

14. In a fuse device of the character described having a compartment formed therein and a discharge orifice in communication therewith, a fuse in the compartment, an arc extinguishing substance in the compartment, and passages formed in the device parallel to the compartcompartment, said passages being angularly disposed at their lower ends and communicating with the discharge orifice whereby when the fuse blowsthe arc extinguishing substance is directed under pressure and at an angle into the discharge orifice.

15. In a fuse device of the character described having a compartment formed therein, a member in the compartment consisting of insulating material, said member having a compartment formed therein terminating in a discharge orifice, a fuse within the compartment, an arc extinguishing substance in the compartment, and a passage formed in the member and parallel to the .chamber, said passage being in communication with the compartment at its upp r end and the lower end of the passage being angular and adapted to direct the arc'extinguishing substance to a point to play upon an are caused by the blowing of the fuse.

16. A fuse device of the character described having a compartment formed therein adapted to contain a.member constricted of insulating material, said member having a compartment formed therein terminating in a discharge orifice and said member having a passage formed therein and offset with relation to the discharge orifice, said passage being connected with the discharge orifice on an angle.

1'7. In a high tension fuse of the expulsion type, the combination of a relatively long body member of insulating material having an expulsion chamber at one end thereof adapted to contain an arc extinguishing substance, a dividing partition between said expulsion chamber and the remainder of said body member, a fuse supported within said body member projecting through an opening in said partition and having a fusible portion located within said expulsion chamber, means for withdrawing the end of said fuse from said compartment through said partition when the fusible portion is fused, and a valve for closing the opening through said partition whereby the escape of the arc extinguishing substance from said expulsion chamber through the partition will be prevented.

18. In a high tension fuse of the expulsion type, the combination of a relatively long body member of insulating material having an expulsion chamber at one end thereof adapted to con.- tain an arc extinguishing substance, a dividing partition between said expulsion chamber and the remainder of said body member, a fuse supported within said body member projecting through an opening in said partition and having a fusible portion located within said expulsion chamber, means for withdrawing the end of said fuse from said compartment through said partition when the fusible portion is fused, and a ball check valve adjacent the opening in said partition, said valve adapted to automatically close when pressure is generated and thereby prevent escape of the arc extinguishing medium and gases from the expulsion chamber through the partition.

19. In a fuse device a renewable cartridge for insertion in a supporting housing, said cartridge containing a fusible element, and means operable by pressure generated by fusion of said element to cause a stream of arc extinguishing substance to play at an angle on an arc in said cartridge.

20. In a fuse device, a tube having metal end ferrules, one ferrule adapted to permit insertion of a renewable cartridge, a fragile member closment and connected at their upper ends with the I insertion of a renewable cartridge, a fragile member closing one end of said cartridge, a conducting plunger extending through the opposite end of said cartridge and connected to a fuse element in the cartridge, tension means connected with the plunger, and an arc extinguishing substance in the cartridge.

22. In a fuse device an insulating tube having metal end terminals, a renewable fuse cartridge containing a fusible element, said cartridge adapted to be inserted in said insulating tube, and means operable by pressure generated by fusion of said element to cause a fragile end of the renewable cartridge to be blown outward and thereby relieve said cartridge of excess pressure.

23. In a fuse device, the combination of a fuse supporting body havinga closed compartment formed therein with a discharge orifice at one end thereof, a fusible element and an arc extinguishing substance in said compartment, and a fragile diaphragm closing the compartment at the orifice end. and adapted to be ruptured by pressure from within said compartment.

24. In a fuse device, a renewable fuse cartridge consisting of an insulating body, said insulating body having a fusible element mounted therein, a discharge orifice formed at one end of the-insulating member and a passage at one side of the discharge orifice, a fragile member forming a closure for the discharge orifice and the passage, a head member on the opposite end of the insulating member and having a passage formed therein for the reception of a plunger, and means connecting the plunger with a fusible element.

25. In a fuse device an insulating tube having metal ferrules at each end, said tube adapted to receive an insulated member having a chamber formed therein, a fuse element and an arc extinguishing substance in said chamber, said member being shaped to project the arc extinguishing substance into the are stream at an acute angle with relation'to the axis of the are .means operable by pressure generated by fusing of said element to cause a stream of arc extinguishing substance to play upon an are caused by said fusion, at an acute angle to cause extinction of said arc.

28. In a fuse device, a fusible element, a closed compartment adapted to contain an arc extinguishing substance, and means operable by pressure generated by fusion of said element to force an arc extinguishing substance into the arc stream at an acute angle to aid in the extinction of said arc.

29. In a fuse device, a fusible element and,

means operable by pressure generated by fusion of said element to cause a stream of arc extinguishing substance to play at an acute angle upon an are caused by fusionof said element,

-thereb3 aiding in the extinction of said arc.

30. In a fuse device of the character described having a compartment formed therein and a discharge orifice in communication therewith, a fuse in the compartment-an arc extinguishing substance in the compartment, a passage formed in the device and connected with the discharge orifice atone end and with the compartment at the other end, whereby when the fuse blows an arc extinguishing substance is directed under pressure on an acute angle into'the discharge orifice.

31. In a fuse device, a renewable fuse cartridge consisting of an insulating body, said insulating body having a fusible element mounted therein, a discharge opening formed at one end of the insulating member and a passage at one side of the discharge opening, a fragile member-forming a closure for the discharge opening and said passage, a head member on the opposite end of the insulating member and having a passage formed therein for the reception of a plunger, and means connecting the plunger with a fusible element.

32. In a fuse device a tube having metal end terminals, one terminal adapted to permit insertion of a renewable cartridge, said cartridge com-,

charge opening.

33. In a fuse device a tube having metal end terminals, one terminal adapted to permit insertion of a renewable cartridge, said cartridge comprising an insulating tube, one end of said tube being closed, a conducting plunger extending through the closure and connected to a fuse element, said insulating tube having a discharge opening formed in the other end, a member in said tube having a central passage containing the fuse element and connected with the discharge opening, and another passage formed in said member and offset with respect to the. central passage but communicating therewith.

34. In a fuse device, an expulsion'tube, a fuse element within the tube, a housing having a chamber forming a continuation of the tube, said chamber acting as a receptacle for expelled parts from the fuse device, and a sealing member interposed between the fuse element and the chamber.

35. In a fuse device, an expulsion tube, a fuse element within the tube, a housing having a chamber forming a continuation of the tube, said chamber acting as a receptacle for expelled hot gases and parts of the fuse device, a sealing- 3'7. In a high tension fuse device an expulsion].

tube, a. fuse element in the tube, a housing'having a chamber forming a continuation of said tube, said chamber acting as a receptacle for hot gases and expelled parts from the fusedevioe, and venting means in the housing for allowing the escape of gases at an angle with'relation to the longitudinal. axis of the tube. V

' 38. In ahigh tension fuse device anexpulsion tube, 'a fuse element in the tubefa housing having a chamber forming a continuation of said tube, said chamber acting as a receptacle for hot gases and expelled parts from the fuse device, venting means in the housing for allowing the escape of gases at an angle with relation to the longitudinal axis of the tube,'and means for rapidly cooling the gases.

39. In a high tension fuse device an expulsion tube, a fuse element and an arc extinguishing substance in the tube, a housing having a chamber forming a continuation of said tube, said chamber acting as a receptacle for hot gases and expelled parts from the fuse device, and venting means for allowing the escape of gases from the housing at an angle with relation to the longitudinal axis of the tube and housing.

40. In a fuse device, an expulsion tube, a member constructed of insulating material disposed within the tube, said member having a chamber formed therein terminating in a discharge passage. a fuse element and an arc extinguishing substance in the chamber, said arc extinguishing substance being expelled through the discharge passage during blowing of the fuse and a second passage formed in said member and offset with relation to the discharge passage and adapted to direct a portionof the arc extinguishing medium into said discharge passage.

41. In a fuse device, an expulsion tube, a renewable fuse cartridge insertable in said tube, said cartridge having a chamber formed therein terminating in a discharge passage, a fuse element and an arc extinguishing substance in the cartridge, said are extinguishing medium being expelled through the discharge passage of the cartridge during blowing of the fuse, and a second passage formed in the cartridge and offset with relation to the discharge passage and adapted to direct a portion of the arc extinguishing medium into said discharge passage.

42. In a fuse device, an expulsion tube, a fuse element within the tube, an arc extinguishing substance within the tube, a housing having a chamber forming a continuation of the tube, said chamber acting as a receptacle for expelled parts from the fuse device, and a sealing member interposed between the fuse element and the chamber.

43. In a fuse device, an expulsion tube, a fuse element within the tube, an arc extinguishing substance within the tube, a housing having a chamber forming a continuation of the tube, said chamber acting as a receptacle for ex lled hot gases and parts of thefuse device, a sea ing member interposed between the fuse elemeht and said chamber, and means in the chamber for rapidly cooling-the gases.

44. In a fuse device, an expulsion tube, a fuse element within the tube, an arc extinguishing substance within the tube, a housing having a chamber forming a continuation of the tube, said chamber acting as a receptacle for expelled parts from the fuse device and an expellable sealing member interposed between the fuse element and said chamber.

45. In a high tension fuse device, an expulsion tube, a fusible element in the tube, an arc extinguishing substance in the tube, and'a housing having a chamber forming a continuation of said tube, said chamber acting as a receptacle for expelled hot gases and parts from the fuse device.

46. In a high tension fuse device, an expulsion tube, a fusible element in the tube, an arc extinguishing substance in the tube, a housing having a chamber forming a continuation of said tube, said chamber acting as a receptacle for expelled hot gases and parts from the fuse device, and means in the chamber for rapidly cooling the gases.

47. In a. high tension fuse device, an expulsion tube, a fusible element in the tube, an are extinguishing substance in the tube, a housing having a chamber forming a continuation of said.

said chamber acting as a receptacle for expelled hot gases and parts from the fuse device, means in the chamber for rapidly cooling the gases, and means for allowing escape of the cooled gases.

49. In a fuse device of the expulsion type, a housing, an expulsion tube of insulating material adapted to be inserted in said housing, a fuse within the expulsion tube, said tube having an enlarged chamber which forms a continuation of said tube and said enlarged chamber having means mounted therein adapted to act as a receptacle for expelled parts, means in the enlarged chamber for cooling hot expelled gases, and means for allowing an escape of the cooled gases.

50. In a fuse device of the expulsion type, the combination with an ,expulsion member constructed of insulating material and having a passage formed therein of a fuse element within said passage, an enlarged chamber forming a continuation of the passage, and means in said chamber to prevent the escape of expelled particles but allowing the escape of gases.

51. In a fuse device of the expulsion type, the combination with an expulsion member constructed of insulating material and having a passage formed therein, of a fuse element within said passage, an enlarged chamber forming a continuation of the passage, means in said chamber to prevent the escape of expelled particles but allowing the escape of gases, and means in the chamber for rapidly cooling the gases entering.

the chamber during the blowing of the fuse.

52. In a fuse device of the expulsion type, a housing, an expulsion tube of insulating material adapted to be inserted in said housing, a fuse within the expulsion tube, said tube having an enlarged chamber which forms a continuation of said tube and said enlarged chamber having means mounted therein adapted to act as a receptacle for expelled particles, and means in said chamber for allowing escape of gases during the blowing of the fuse.

53. The combination with a fuse device of the character described of a receptacle connected with the expulsion end of the fuse device, and means in the receptacle for rapidly cooling the gases generated during blowing of the fuse and to prevent excessive pressure from being formed in the fuse device. 1

54. In a high tension fuse device, an expulsion tube, a fusible element within the tube, a terminal member on the expulsion end of the tube, and a receptacle connected with the terminal member, said receptacle being adapted to act as a receiver for expelled parts from the expulsion tube.

, 55. In combination with a fuse of the expulsion type, said fuse having an aperture through which any arc created is expelled, a receptacle in communication with said aperture and in alignment therewith, and means in said receptacle adapted to prevent the escape of flaming or molten particles from the fuse, said means permitting escape of gases generated during blowing of the fuse.

56. In combination with a fuse of the expulsion type, said fuse having an aperture through which any are created is expelled, a receptacle in communication with said aperture and in alignment therewith, said receptacle having a screened escape passage adapted to prevent the escape of flaming or molten material from the fuse to the surrounding atmosphere by permitting the escape of gases generated during blowing of the fuse.

GEORGE LESLIE HILL. 

